diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_AssemblyLine.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_AssemblyLine.java
index 79f80a1d..d4c77767 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_AssemblyLine.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_AssemblyLine.java
@@ -135,6 +135,7 @@ public class GT_MetaTileEntity_AssemblyLine
             }
         }
         this.mMaxProgresstime = Math.max(1, this.mMaxProgresstime);
+        updateSlots();
         return true;
     }